The Eclipse NT-6352 3-in-1 Metal Voltage Stud Detector is multi-use tool that is used to accurately detect live or dead electrical cables, water, or gas pipes, and wooden studs or battens. This unit has a depth penetration of 18-20 mm and is powered by a 9V battery (sold separately). The Eclipse NT-6352 3-in-1 Metal Voltage Stud Detector features a LED and buzzer to indicate when a cable, pipe or beam is found. This unit can have the sensitivity adjusted easily by using a precision screwdriver (sold separately).